/Engine/Source/Runtime/Interchange/Core/Public/Nodes/InterchangeFactoryBaseNode.h
Each Attribute that was set and have a delegate set for the specified UObject->UClasswill get the delegate execute so it apply the attribute to theUObjectproperty. See the macros IMPLEMENT_NODE_ATTRIBUTE_SETTER at the top of the file to know how delegates are setup for property.
void ApplyAllCustomAttributeToObject ( [UObject](API\Runtime\CoreUObject\UObject\UObject) * Object ) const